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2$            SIOBPHOLOGT AND EVOLUTION                j
also ridges on two naked areas on the tail. The increased tactile area is associated with ocular changes described below.
FIG. 6.—A, hand, and B, foot of Semigalago demidoffi ; nat. size. C, hand, and D, foot of Tarsizts ; nat. size. 1—4, intermediate pads ; I, II, proximal pads (Pocock).
Vibrissae.—The genal and submental vibrissae are absent, as in the Lorises and Pottos; and the loss of these tufts is a derivative feature (Pocock). It indicates that these animals are more specialized than the